Piston-ring



Fl H. CARR PSYQN RING.

Avmlcaxon min uw, la. 1919.

Patented Aug# 31, 1920.

UNITED STATES FRANK It. GARR, 0F XENIA, OHIO.

PISTON-BING.

Specification of Letters Patent.

Application led December 18, 1919. Serial No. 345,707.

To au w/Lom z't may concern:

Be it known that l, FRANK R. CARR, e citizen of the United States, residing at Xenia, in the county of (ireene and State of Ohio, have invented certain new and useful Improvements in Pistor1-llings,of which the following is a specification.

This invention relates to new and useful improvements in piston rings for internal combustion engines.

The object of the invention is to provide means inherent in the structure of the piston ring for increasing the efficiency of the cngine. The means so inherent in the piston ring structure consists in the provision of structural features which prevent any leakage of the compressed explosive. mixture between the surrounding wall of the engine cylinder and the piston ring, and said structural features further relate to means for preventing `any surplus of lubricating oil from accumulating on the surrounding cylinder Wall as shall be hereinafter more fully described in connection with the accompanyin r drawings.

teferring to the said drawings in general terms, Figure l is an elevation of the piston iu connection with which my improved ring is exemplied. One of the rings is shown in section While others appear full. Fig. 2 is an elevation of the )iston ring removed from the piston, and 4`ig. 3 is a section of the piston ring on the line 3-3 of F ig. 2.

In a more particular description of the invention similar reference characters will indicate the same parts in the drawings.

The ring -1- is cut through on one side to permitof the necessary compression and expansion when in the peripheral groove 2 of the piston -3. The said eut may be in the form of steps 4.- or tapered abutting or matching edges -5-. 0r the out through the ring on one side may be in an form.

The more particular features of the ring -1- comprise the groove -6- in the upper edge of the ring. The inner wall of this groove is parallel to the axis of the piston or the ring itself, while the outer Wall of the said groove extends in an outer and upward taper to the periphery of the ring. The said groove -6 having these structurel characteristcs prevents any leakage of the explosive mixture from the front or the iston around the periphery thereof, While t e explosive mixture is being compressed by the piston. lVhile the piston is moving on its compression stroke the fiuid ahead of the said piston deflected inwardly toward the center of the piston by the tapered Wall of the groove` This action materially relieves the pressure of the explosive mixture around the periphery of the piston and consequently the tendency to leakage around the piston and between it and the walls oi the cylinder. The groove -7- in the lower part of the periphery of the ring is an oil groove and its construction as shown in Fig. 3 is in the form of an upper horizontal wall and n. downwardly and outwardly tapered wall at the bottoni. Any surplus of the lubricating oil is prevented from accumulating on the surroninling wall of the cylinder above the pistou owing to the formation of the said groove -7--. it will be noted that the lower tapered wall of said oil groove terminates above the lower end of the ring which providoes a peripheral surface at that point that engages the wall of the cylinder and prevents thc oil emptying from the groove on to the surrounding wall of the cylinder. The usual carbonization taking place in a cylinder of an internal combustion engine due to the admixture of the products of combustion with the lubricating oil adhering to the walls of the cylinder and in the head thereof is very materially reduced owing to the formation of the said oil groove near the lower end of the ring surface.

A further feature which adds to theedvantages of the ring is due to its being con structed in one piece with the said grooves -Gw and --7-* so arranged. The tendency for carbon to accumulate is materially less as comparedwith a ring constructed of more than one integral part or in different parts. And in addition, through the instrumentality of the specially formed grooves, s. ring having a maximum of compression ceparity, and a decided retardation in the process oi' carlmnization. is the result.

Having described my invention I claim:

lPatented Aug. 31, 1920.

The combination with a piston, of e oneI piece piston ring disconnected on one side,V

the said ring having an annular groove i ine groove being purullel to the axis off the ring and the outer wall t ereof bein; tulpered outwardly and upwur ly from tio uwer terminul of Huid inner wall to provide n deflecting surfuoe for the explosive mixture while under compression, und an outer peripheral oil groove in said ring inelosed by an upper lmrizontnl will] und u lower outwardly and downwardly tapered wall, Huid lest named wall being terminated above the -lowur end 10 of the ring, substantially us specified.

In testimony whereof l affix my .signnture FRANK. R. CARR. 

